Here is a recommended reading list.
Hold Me Tight
By Sue Johnson
The Gifts of Imperfection
By Brene Brown
By Daniel Goleman
The Body Keeps Score - Brain, Mind, and Body in the Healing of Trauma
By Bessel Van Der Kolk, M.D.
The Seven Principles for Making Marriage Work - A Practical Guide from the Country's Foremost Relationship Expert
by John M. Gottman PHD
Why Marriages Succeed or Fail - And how you can make yours last
by John Gottman PHD
After the Affair - Healing the Pain and Rebuilding Trust When a Partner Has Been Unfaithful
by Janis Abrahms Spring, PHD with Michael Spring
The Gift of Therapy
by Irvin Yalom, MD